File:VIEW LOOKING NORTHWEST AT A SIGNAL REACTOR OR CHOKE COIL. WITHIN THE PROTECTIVE ENCLOSURE IS AN AIR AND PORCELAIN INSULATED COIL OF 5-8' DIAMETER STRANDED COPPER WIRE. REACTOR HAER CONN,1-GREWI,15A-61.tif
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![File:VIEW LOOKING NORTHWEST AT A SIGNAL REACTOR OR CHOKE COIL. WITHIN THE PROTECTIVE ENCLOSURE IS AN AIR AND PORCELAIN INSULATED COIL OF 5-8' DIAMETER STRANDED COPPER WIRE. REACTOR HAER CONN,1-GREWI,15A-61.tif](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b0/VIEW_LOOKING_NORTHWEST_AT_A_SIGNAL_REACTOR_OR_CHOKE_COIL._WITHIN_THE_PROTECTIVE_ENCLOSURE_IS_AN_AIR_AND_PORCELAIN_INSULATED_COIL_OF_5-8%27_DIAMETER_STRANDED_COPPER_WIRE._REACTOR_HAER_CONN%2C1-GREWI%2C15A-61.tif/lossy-page1-426px-thumbnail.tif.jpg?20140708163633)
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